docs: def _check_validity(cls, text):
          """Check the validity of a TLE
  
          Args:
              text (tuple of str)
          Raise:
              ValueError
          """
  
          if not text[0].lstrip().startswith('1 ') or not text[1].lstrip().startswith('2 '):
              raise ValueError("Line number check failed")
  
          for line in text:
              line = line.strip()
              if str(cls._checksum(line)) != line[-1]:
                  raise ValueError("Checksum validation failed")